1947, 3¢ Postage Stamp Centenary. Tied by "New York N.Y. May 17, 1947" Centenary cancel on Dorothy Knapp hand-painted First Day cover, depicting 5¢ and 10¢ stamps at bottom, light toning along back flaps as often occurs, Very Fine, a scarce and desirable design. Scott No. 947  Estimate $1,000 - 1,500. $0 (Image)